new prep 174 关于so as to

rucstarchan

Often major economic shifts are so gradual as to be indistinguishable at first from ordinary fluctuations in the financial markets.
A. so gradual as to be indistinguishable
B. so gradual so that they can be indistinguishable
C. so gradual that they are unable to be distinguished
D. gradual enough not to be distinguishable
E. gradual enough so that one cannot distinguish them

这道题答案是A。

但是OG12 37题C选项的解释说：The construction so x as to y is not a correct idiom.

求解，谢谢！

ybava018919

OG 上的很多都是通过累赘排除的。你发现了没
A 我觉得读起来很累赘 很累 所以在很多语法知识点用完之后，咱们只有考语感了。。。

rucstarchan

答案就是A···

rucstarchan

关于unable to do sth，我觉得应该表示的是主语本身不具有这个能力，而非“不能被...”

EthanEthan

manhattan语法里面说，so ……as to有时候是suspect的用法。

rucstarchan

非常感谢~~